It was always hammered home to me that the overtaking vehicle is the responsible party, period. I've always kept that in the front of my mind not matter if I'm riding and passing other cyclists, or when I'm driving. If one can't pass safely at that moment, just wait a couple seconds. It boggles the mind that cars need to be wherever so quickly they can't give up a few heartbeats for another person on the road. This also applies to the way I've noticed them treating peds in the intersection and on cross walks, let them pass for cryin' out loud.